[llvm-dev] How to revert a change properly

[Xing GUO via llvm-dev]

Hi folks,

Several days ago, I made a bad change in llvm, and I reverted it using
following command
```
$ svn merge -r <bad change revision>:<previous revision>
```
However, this command seemed not working properly. I would like to know,
what's the right way to revert a bad change. I notice that there are some
reverting change with proper message, e.g. "Revert: [some tag] commit
message". Shall I type this message manually? Or is there some useful tool
that I could use?

Best Regards,
Xing
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